Area code 231
Area code 231 serves Muskegon and nearby parts of Michigan, including Traverse City, Petoskey and Ludington. It is on Eastern Time, which observes daylight saving time.
Area code 231 at a glance
| State | Michigan (MI) |
| Main city | Muskegon |
| Time zone | Eastern Time |
| UTC offset | UTC−5 in winter, UTC−4 in summer |
| Daylight saving time | Yes |
Cities in 231
- Muskegon
- Traverse City
- Petoskey
- Ludington
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 231 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 231 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 231 between |
|---|---|
| Eastern | 8:00 AM to 9:00 PM |
| Central | 7:00 AM to 8:00 PM |
| Mountain | 6:00 AM to 7:00 PM |
| Arizona | 5:00 AM to 6:00 PM |
| Pacific | 5:00 AM to 6:00 PM |
See the time in 231 without leaving your CRM
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Other area codes in Michigan
Questions about 231
What time zone is area code 231?
Area code 231 is on Eastern Time. It observes daylight saving time.
Where is area code 231?
Area code 231 is in Michigan. Its main city is Muskegon, and it also covers Traverse City, Petoskey and Ludington.
What are the legal hours to call a 231 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.